The University of Tokyo · 공학
Lei Qin 교수의 연구실은 주로 액체 질소를 활용한 코일 및 암석의 균열 제어 기술에 초점을 맞추고 있으며, 특히 코일체에서의 기체 흡착 능력 향상과 메탄 추출 효율을 높이기 위한 액체 질소 동결-해동 처리 기법을 연구하고 있습니다. 다양한 동결 시간, 동결-해동 사이클, 수분 함량 등 변수가 코일의 기계적 성질과 균열 구조에 미치는 영향을 실험적으로 분석하며, 음향 에미션 및 초음파 속도 측정을 통해 균열 발생 메커니즘을 규명하고 있습니다. 이는 비수분 기반의 코일 균열 기술로서 비정규 유전체 자원 개발에 기여하는 핵심 기술입니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
This study explores how liquid nitrogen (LN2) freezing affects the physical pore and fracture structure of coal. Under lab-controlled conditions, coal specimens were frozen with LN2 under different conditions and thawed, and then the uniaxial compressive strengths, acoustic emissions, and ultrasonic wave velocities of the different specimens were compared. After 60 min of freezing for one set of specimens and 30 freeze–thaw cycles for another set, the elastic moduli of the coal specimens decreas
Freeze-thaw induced fracturing coal by liquid nitrogen (LN<sub>2</sub>) injection exerts a significant positive effect on the fracture permeability enhancement of the coal reservoir. To evaluate the different freeze-thaw variables which modify the mechanical properties of treated coals, the effects of freezing time, number of freeze-thaw cycles, and the moisture content of coal were studied using combined uniaxial compression and acoustic emission testing systems. Freezing the samples with LN<su
Liquid nitrogen (LN2) fracturing is an anhydrous fracturing technology that enhances coal permeability and supports unconventional oil and gas exploitation. In this Review, we provide a systematic review of five aspects of LN2 fracturing. They are the history of the technology’s development, research topics, factors influencing fracturing efficiency, fracturing mechanism, and engineering processes and systems. Liquid nitrogen fracturing transforms coal and rock pore structure through mechanisms
Studying the law of coal adsorption capacity under the action of liquid nitrogen is very important for the extraction of coalbed methane. For this study, the lignite’s ability to adsorb methane was studied after it had been frozen by a number of different freezing techniques. In addition, the changes in the organic functional groups on the coal after freezing were identified by using infrared spectroscopy. The results demonstrate that as the duration of liquid nitrogen freezing and the number of
